@MJMSRI ,Not aware of any such HA script/workflow, but nonetheless, if you are trying to emulate real world scenarios e.g. one site loses power or super-eager digger cuts the ISL, then do it like that e.g. turn all the nodes off abruptly via iLO or pull all the cables/disable switchports of the NICs backing the vSAN network on those nodes.
Or use the always amusing vsish reliability crashMe injector to PSOD the nodes if you want to also test crash auto-restart functionality which IIRC iLO can have configured (which is also maybe a contentious topic as it doesn't wait for coredump.to.complete as far as I recall).
